Tropical-Rouge PreCure is a good time if you're looking for a chill magical girl anime that doesn't take itself too seriously. However, it doesn't measure up to other PreCure seasons in terms of plot and character development. I didn't expect much going into the series, so I was surprised by the bits of lore and ideas that could have been great if developed properly. Unfortunately, the ocean theme of the show is highly underutilized. Watching the girls try various things is fun but plot-related episodes are scarce. The monsters are quite weak and on the occasions that they are strong, the characters get magically saved. The girlsare usually all together and their friendship is well-established, but there is a lack of character focused episodes. They have some unique traits and battle techniques, though. While I enjoyed the villains' family dynamic, they don't really challenge the heroines in any way since their whole shtick is being unmotivated.
Overall, Tropical-Rouge is enjoyable when it comes to slice-of-life, but not so much when it comes to magical battles. I wish it had done more with its themes of the ocean and motivation, but it works quite well as a comfort show.